There is a workaround: run DP 8 in 32-bit mode (select in Finder, command-I, then choose 'Open in 32-bit mode').

Or: upgrade to OS X 10.8 or later...

Keep in mind that some software (such as Ableton Live 8) will auto-install that ReWire driver. Numerology 4 will install that driver as well, but I have disabled that behavior for now when running on 10.6.8...